Signals and Systems - ECE Questions and Answers

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Which one most appropriate dynamic system?

y(n) + y(n - 1) + y(n + 1)

y(n) + y(n - 1)

y(n) = x(n)

y(n) + y(n - 1) + y(n + 3) = 0

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An energy signal has G(f) = 10. Its energy density spectrum is

100

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Consider Pole zero diagram as shown, If two Poles are moved in opposite direction towards ω = p/2 and -p/2, the filter will be

change to high pass filter

change to Band Pass filter

remains same

change to LPF

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In an ac circuit the fundamental component of current wave lags the corresponding voltage wave by 20°. The third harmonic component of current wave lags the corresponding voltage by an angle.

less than 20°

more than 20°

equal to 20°

equal to or more than 20°

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If and A + B is

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A first order system will never be able to give a __________ response

band stop
band pass
all pass

Choose the correct option

1, 2, 3 true

1 and 3 true, 2 false

1, 2 are true 3 is false

1, 2 are false, 3 is true

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In the given figure the ratio T/d is the duty factor.

True

False

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If £[f(t)] = F(s), then £[f(t - T)] =

e^st F(s)

e^-st F(s)

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The z-transform of a particular signal is given
where

The system after implementation will be

casual and stable

non-casual and stable

non-casual and unstable

casual and unstable